Learn a Fact: 1 x 9

1
0
x  4
2
1
x  8
3
3
x  1
4
0
x  2
5
9
x  1
6
1
x  1
7
0
x  5
8
3
x  0
9
1
x  0
10
7
x  0
11
0
x  6
12
7
x  1
13
5
x  1
14
1
x  2
15
9
x  0
16
1
x  6
17
4
x  1
18
0
x  8

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